CN113458351A - MnO-containing high-aluminum steel casting powder - Google Patents
MnO-containing high-aluminum steel casting powder Download PDFInfo
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- CN113458351A CN113458351A CN202110788253.XA CN202110788253A CN113458351A CN 113458351 A CN113458351 A CN 113458351A CN 202110788253 A CN202110788253 A CN 202110788253A CN 113458351 A CN113458351 A CN 113458351A
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- aluminum steel
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 41
- 239000010959 steel Substances 0.000 title claims abstract description 41
- 238000005266 casting Methods 0.000 title claims abstract description 40
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 31
- 239000000843 powder Substances 0.000 title claims abstract description 22
- 238000002844 melting Methods 0.000 claims abstract description 12
- 230000008018 melting Effects 0.000 claims abstract description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 7
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 7
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 7
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 7
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 3
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 claims abstract description 3
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims abstract description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 3
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 claims abstract description 3
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 3
- 230000004907 flux Effects 0.000 claims description 12
- 238000002425 crystallisation Methods 0.000 claims description 6
- 230000008025 crystallization Effects 0.000 claims description 6
- 238000011534 incubation Methods 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 9
- 239000000203 mixture Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 238000001179 sorption measurement Methods 0.000 abstract description 4
- 230000000087 stabilizing effect Effects 0.000 abstract description 3
- 239000002893 slag Substances 0.000 description 25
- 230000000704 physical effect Effects 0.000 description 10
- 238000009749 continuous casting Methods 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 4
- 230000002401 inhibitory effect Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910002551 Fe-Mn Inorganic materials 0.000 description 1
- 229910000794 TRIP steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000006184 cosolvent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001678 gehlenite Inorganic materials 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- CASZBAVUIZZLOB-UHFFFAOYSA-N lithium iron(2+) oxygen(2-) Chemical compound [O-2].[Fe+2].[Li+] CASZBAVUIZZLOB-UHFFFAOYSA-N 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The MnO-containing high-aluminum steel casting powder comprises the following components in percentage by mass: 18 to 30 percent of CaO and SiO2 25％～40％、MnO12.5％～14.5％、Al2O3 0～6％、Na2O 3％～9％、Li2O 1％～3％、MgO 0.5％～5.5％、F‑7 to 12 percent, and the balance of inevitable impurities. The invention specifically aims at that the carbon content is 0.3-0.6 percent and the aluminum content is 0.5-1.5 percent, the invention has the functions of stabilizing the alkalinity and reducing the melting point and the viscosity in the using process, has better adsorption effect on inclusions in steel, has small change of the viscosity and the melting point of the casting powder before and after casting, has good crystallizer state, and can reduce expensive LiO2The dosage of the composition is reduced, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to high-aluminum steel casting powder with good physical and chemical properties and a control technology for inhibiting and slowing down a slag steel reaction in a continuous casting process.
Background
The aluminum is added into the steel as an alloy element to form high-aluminum steel with the aluminum content of more than 0.5 percent, such as TRIP steel with the aluminum content of 0.6-1.7 percent, and the high-aluminum steel has high strength and high ductility due to the unique strengthening and toughening mechanism and high strength and toughness; the Al content in the non-magnetic steel can reach 1.5-2.5%, the transformation of martensite in Fe-Mn can be effectively reduced, the problem of work hardening can be improved, and the non-magnetic steel is widely applied to electrical equipment.
But the addition of aluminum also presents a great challenge to the continuous casting process of high-aluminum steel. The aluminum in the molten steel is easy to react with the SiO in the covering slag2Oxidation-reduction reaction is carried out to lead Al in the casting powder to be2O3The content is rapidly increased, and the alkalinity (wCaO/wSiO) is simultaneously increased2) The temperature of the casting powder is increased rapidly due to the increase of alkalinity, the crystallization temperature of the casting powder is increased, the crystal inoculation time is shortened, and the casting powder rapidly presents short slag property in the casting process; at the same time Al in the covering slag2O3The rapid increase of the content promotes the generation of high-melting-point substances such as gehlenite and the like, and can also cause the increase of slag crystallization temperature, and the combined action of the two factors can lead the slag ring to develop seriously in the casting process of high-aluminum steel, prevent liquid slag from flowing into a gap between a crystallizer and a casting blank and be difficult to form a slag film necessary for controlling lubrication and heat transfer.
Disclosure of Invention
The invention aims to provide high-aluminum steel casting powder containing MnO, which has better adsorption effect on inclusions in steel, has small change of viscosity and melting point of the casting powder before and after pouring and good crystallizer state, and can reduce expensive LiO (lithium iron oxide)2The dosage of the composition is reduced, and the cost is reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
the high-aluminum steel casting powder containing MnO comprises the following components in percentage by mass: 18 to 30 percent of CaO and SiO2 25％～40％、MnO 12.5％～14.5％、Al2O3 0～6％、Na2O 3％～9％、Li2O 1％～3％、MgO 0.5％～5.5％、F-7 to 12 percent, and the balance of inevitable impurities; the high-aluminum steelThe content of the carbon is 0.3 to 0.6 weight percent, the content of the aluminum is 0.5 to 1.5 weight percent, and the aluminum-containing silicon-aluminum alloy has the functions of stabilizing the alkalinity and reducing the melting point and the viscosity in the using process.
The melting point of the covering slag is 1060-1289 ℃, and the viscosity of the covering slag is 0.09-0.42 Pas at 1300 ℃.
The alkalinity of the covering slag is 0.6-1.51.
The crystallization temperature of the covering slag is 1190-1280 ℃, the crystallization incubation time is 18-26 s, and the average heat flow density is 1.12-1.62 MW/m2。
The action mechanism of the MnO-containing high-aluminum steel casting powder is as follows:
ΔGθ 1＝-164550+26.775T (1-2)
ΔGθ 2＝-168990+0.75T (1-4)
by thermodynamic calculation, Δ G at 1600 ℃2＜ΔG1Description of [ Al]Will preferentially react with MnO, thereby inhibiting SiO2Quilt [ Al]Reducing while MnO-SiO is formed in the slag2And 2MnO-SiO2A low melting point compound with stable structure, and play a role in slowing down [ Al]The deterioration of the viscosity and other physical properties of the mold flux is reduced by the effect of the reduction reaction.
The physical and chemical properties of the high-aluminum steel casting powder prepared by the invention meet the continuous casting requirement of high-aluminum steel, and are reasonable.
Compared with the prior art, the invention has the beneficial effects that:
the device of the invention has simple structure, reasonable design and convenient operation, and the following beneficial effects can be obtained through the device:
1) the MnO-containing high-aluminum steel casting powder disclosed by the invention mainly aims to add a proper amount of MnO: based on the principle of thermodynamics, in continuous casting[Al]Will preferentially react with MnO, and [ Al]Reaction ratio with MnO [ Al ]]With SiO2The reaction of (A) is much slower, thereby inhibiting and slowing down [ Al]The reduction reaction reduces the melting temperature and viscosity of the mold powder under the combined action of the cosolvent, and weakens the deterioration of the crystal physical property parameters of the mold powder.
2) The MnO-SiO is formed in the slag simultaneously2(1270 ℃ C.) and 2MnO-SiO2(1327 ℃) the low-melting-point compound with stable structure plays a role in inhibiting and slowing down [ Al]And (4) carrying out reduction reaction.
3) The MnO-containing high-aluminum steel casting powder has the alkalinity of 0.6-1.51, has a good adsorption effect on inclusions in steel, does not change the viscosity and the melting point of the casting powder greatly before and after pouring, has a good crystallizer state, and can reduce expensive LiO2The dosage of the composition is reduced, and the cost is reduced.
Detailed Description
The invention is further illustrated by the following examples, which are intended to be illustrative only and are not intended to be in any way limiting.
The preparation process comprises the following steps: the preparation method comprises the steps of weighing the raw materials of the covering slag according to target components, mechanically stirring and uniformly mixing, heating and pre-melting the mixed slag, removing volatile components and gas substances to form complex pre-melted slag among the components, and carrying out water cooling, crushing and fine grinding on the melted slag to obtain the required covering slag powder.
The slag after casting in the examples refers to a slag film sample taken out from the crystallizer.
Example 1:
the main components of the smelting steel are shown in table 1, the section of a casting blank is 280 x 380mm, the pulling speed is 0.8m/min, the flow is 4, and the main components and the physical property parameter change before and after casting of the covering slag are shown in table 2.
Table 1 example 1 steel grade main composition wt.%
| C | Si | Mn | P | S | Al |
| 0.42 | 0.45 | 1.4 | 0.012 | 0.006 | 0.6 |
TABLE 2 variation of main components and physical properties before and after casting of the C/Al steel mold flux in example 1
Example 2
The main components of the smelting steel seeds are shown in table 3, the section of a casting blank is 280 x 380mm, the casting speed is 0.8m/min, the flow is 4, and the main components and the physical property parameter change before and after casting of the covering slag are shown in table 4.
Table 3 example 2 steel grade main composition wt%
| C | Si | Mn | P | S | Al |
| 0.5 | 0.42 | 1.5 | 0.011 | 0.006 | 0.84 |
TABLE 4 variation of main components and physical properties before and after casting of the C/Al steel mold flux in example 2
Example 3
The main components of the smelting steel seeds are shown in table 5, the section of a casting blank is 280 x 380mm, the casting speed is 0.55m/min, the flow is 4, and the main components and the physical property parameter change before and after casting of the covering slag are shown in table 6.
Table 5 example 3 steel grade main composition wt%
| C | Si | Mn | P | S | Al |
| 0.55 | 0.48 | 1.77 | 0.011 | 0.0055 | 1.25 |
TABLE 6 variation of main components and physical properties before and after casting of the C/Al steel mold flux in example 3
Comparative example
The main components of the smelting steel seeds are shown in Table 7, the section of a casting blank is 280 x 380mm, the casting speed is 0.55m/min, the flow is 4, and the main components and the physical property parameter change before and after casting of the covering slag are shown in Table 8.
Table 7 comparative examples steel grade main composition wt%
| C | Si | Mn | P | S | Al |
| 0.52 | 0.4 | 1.65 | 0.012 | 0.0058 | 1.21 |
TABLE 8 Change in Main Components and physical Properties before and after casting of conventional mold flux
Through comparison of examples 1, 2 and 3 with comparative examples, the product designed by the invention is more suitable for continuous casting of medium-carbon high-aluminum steel, plays roles in stabilizing alkalinity and reducing melting point and viscosity in the using process, has better adsorption effect on inclusions in steel, has small change of viscosity and melting point of the casting powder before and after casting, has good crystallizer state, and can reduce expensive LiO2The dosage of the composition is reduced, and the cost is reduced.
Claims (4)
1. The high-aluminum steel casting powder containing MnO is characterized by comprising the following components in percentage by mass: 18 to 30 percent of CaO and SiO2 25％～40％、MnO 12.5％～14.5％、Al2O3 0～6％、Na2O 3％～9％、Li2O 1％～3％、MgO 0.5％～5.5％、F-7 to 12 percent, and the balance of inevitable impurities; the carbon content of the high-aluminum steel is 0.3 wt% -0.6 wt%, and the aluminum content is 0.5 wt% -1.5 wt%.
2. The MnO-containing high aluminum steel mold flux according to claim 1, wherein the mold flux has a melting point of 1060 to 1289 ℃ and a viscosity of 0.09 to 0.42Pas at 1300 ℃.
3. The MnO-containing high aluminum steel mold flux according to claim 1, wherein the basicity of said mold flux is in the range of 0.6 to 1.51.
4. The high-aluminum steel mold flux containing MnO according to claim 1, wherein the mold flux has a crystallization temperature of 1190-1280 ℃, a crystallization incubation time of 18-26 s, and an average heat flux density of 1.12-1.62 MW/m2。
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110788253.XA CN113458351A (en) | 2021-07-13 | 2021-07-13 | MnO-containing high-aluminum steel casting powder |
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| CN202110788253.XA CN113458351A (en) | 2021-07-13 | 2021-07-13 | MnO-containing high-aluminum steel casting powder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114558999A (en) * | 2022-03-31 | 2022-05-31 | 广东韶钢松山股份有限公司 | Medium-carbon high-aluminum steel casting blank in bloom, preparation method thereof and spare and accessory parts |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0833961A (en) * | 1994-07-22 | 1996-02-06 | Nippon Steel Corp | Continuous casting method |
| CN101612653A (en) * | 2008-06-23 | 2009-12-30 | 宝山钢铁股份有限公司 | Mold powder for continuous casting of high aluminium-titanium-rare earth steel |
| CN103121090A (en) * | 2013-03-12 | 2013-05-29 | 西峡龙成冶金材料有限公司 | High-manganese medium-carbon peritectic steel continuous casting crystallizer casting powder and preparation method thereof |
| CN103817302A (en) * | 2014-02-27 | 2014-05-28 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer casting powder for large circular blank abrasion resisting high manganese steel |
| CN104511581A (en) * | 2013-09-30 | 2015-04-15 | 上海梅山钢铁股份有限公司 | Molten steel fluxing agent for cold-rolled tin plate |
| CN108176831A (en) * | 2017-12-28 | 2018-06-19 | 西峡龙成冶金材料有限公司 | A kind of high-aluminum steel continuous crystallizer protecting slag |
| JP2018144046A (en) * | 2017-03-01 | 2018-09-20 | 新日鐵住金株式会社 | Mold powder for continuous casting, and continuous casting method for steel |
| CN112828253A (en) * | 2021-01-06 | 2021-05-25 | 鞍钢股份有限公司 | Continuous casting covering slag for high manganese steel |
-
2021
- 2021-07-13 CN CN202110788253.XA patent/CN113458351A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0833961A (en) * | 1994-07-22 | 1996-02-06 | Nippon Steel Corp | Continuous casting method |
| CN101612653A (en) * | 2008-06-23 | 2009-12-30 | 宝山钢铁股份有限公司 | Mold powder for continuous casting of high aluminium-titanium-rare earth steel |
| CN103121090A (en) * | 2013-03-12 | 2013-05-29 | 西峡龙成冶金材料有限公司 | High-manganese medium-carbon peritectic steel continuous casting crystallizer casting powder and preparation method thereof |
| CN104511581A (en) * | 2013-09-30 | 2015-04-15 | 上海梅山钢铁股份有限公司 | Molten steel fluxing agent for cold-rolled tin plate |
| CN103817302A (en) * | 2014-02-27 | 2014-05-28 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer casting powder for large circular blank abrasion resisting high manganese steel |
| JP2018144046A (en) * | 2017-03-01 | 2018-09-20 | 新日鐵住金株式会社 | Mold powder for continuous casting, and continuous casting method for steel |
| CN108176831A (en) * | 2017-12-28 | 2018-06-19 | 西峡龙成冶金材料有限公司 | A kind of high-aluminum steel continuous crystallizer protecting slag |
| CN112828253A (en) * | 2021-01-06 | 2021-05-25 | 鞍钢股份有限公司 | Continuous casting covering slag for high manganese steel |
Non-Patent Citations (1)
| Title |
|---|
| 李殿明等, 冶金工业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114558999A (en) * | 2022-03-31 | 2022-05-31 | 广东韶钢松山股份有限公司 | Medium-carbon high-aluminum steel casting blank in bloom, preparation method thereof and spare and accessory parts |
| CN114558999B (en) * | 2022-03-31 | 2024-04-02 | 广东韶钢松山股份有限公司 | Bloom medium-carbon high-aluminum steel casting blank, preparation method thereof and spare and accessory parts |
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